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Kingdom Hearts II Final Mix was rumored in middle-late 2006. Though Nomura did not confirm its development, he stated that if a Final Mix version were to be created for other countries, he would use a "trump card".

In September 2006, Kingdom Hearts II Final Mix was finally announced, along with a PlayStation 2 remake of Kingdom Hearts: Chain of Memories, entitled Kingdom Hearts Re:Chain of Memories, with full 3-D rendering and voice acting. The two would be packed together, creating Kingdom Hearts II Final Mix+; Re:Chain of Memories was later released in America as a standalone title.

The remake was released on March 29, 2007, hitting stores all across Japan. It was announced late 2013 that Kingdom Hearts II Final Mix would be released in a compilation that also includes the Final Mix edition of Kingdom Hearts Birth by Sleep, as well as the cinematics of Re: Coded. It was released globally in late 2014 under the name Kingdom Hearts HD 2.5 ReMIX.

Scans of magazine articles and preview videos appeared on numerous websites in the weeks leading up to the game's release. They included additional scenes involving the three mysterious armored knights at the end of the Kingdom Hearts II secret ending. Later screenshots showed one of these three knights in combat with Sora, Donald, and Goofy.

The being serves as a secret boss with incredible power and an enormous amount of HP, much like the Unknown from Kingdom Hearts Final Mix. The preview videos also showed that battling Roxas would be possible as opposed to the cutscene in the original game. Square also revealed that data replicas of each member of Organization XIII could be challenged in a secret area at Hollow Bastion and fought independently of the storyline.

Voice-acting on Kingdom Hearts II Final Mix was announced to be mostly in English, with Japanese subtitles, like Kingdom Hearts Final Mix, but the new scenes used Japanese voice-acting when viewed in Theater Mode and were voiceless in-game, but with Japanese subtitles. This is most likely due to the new scenes featuring Organization XIII members from Kingdom Hearts: Chain of Memories, who did not yet have English voice actors.